Abstract:
:Cancer cells recruit monocytes, macrophages and other inflammatory cells by producing abundant chemoattractants and growth factors, such as macrophage colony-stimulating factor (M-CSF/CSF-1) and monocyte chemoattractant protein-1 (MCP-1/CCL2), to promote tumor growth and dissemination. An understanding of the mechanisms that target cancer cells and regulate tumor microenvironment is essential in designing anticancer therapies. Here, we showed that serum amyloid-A (SAA) and cathelicidin (LL-37) stimulated M-CSF and MCP-1 expression with or without lipopolysaccharide (LPS) administration; conversely, lipoxin-A(4) (LXA(4)) and annexin-A1 (ANXA1) inhibited LPS-induced M-CSF and MCP-1 production by human (HepG2) and mouse (H22) hepatocellular carcinoma cells (HCCs). The effects of LXA(4), ANXA1, SAA and LL-37 were dependent on the activation of their mutual cell-surface receptor formyl peptide receptor-2 (FPR2) and subsequent ROS-MAPK-NF-kB signalings. Furthermore, our results indicated that LPS switched macrophages into an IL-10(low)IL-12(high) M1 profile, whereas M-CSF+MCP-1 and FPR2 agonists skewed them into M2 (IL-10(high)IL-12(low)). In that respect, through modulating the phosphorylation of signal transducer and activator of transcription-3 (STAT3), LXA(4) and ANXA1 induced monocyte differentiation into M2a+M2c-like cells and showed antitumorigenetic activities, whereas SAA, LL-37 and M-CSF+MCP-1 led to M2b- or M2d-like polarization, which exacerbated HCC invasion in vitro and in vivo, respectively. Our results suggest that FPR2 has an appreciable pleiotropic regulator role in tumor immunoediting.
journal_name
Oncogenejournal_title
Oncogeneauthors
Li Y,Cai L,Wang H,Wu P,Gu W,Chen Y,Hao H,Tang K,Yi P,Liu M,Miao S,Ye Ddoi
10.1038/onc.2011.112subject
Has Abstractpub_date
2011-09-08 00:00:00pages
3887-99issue
36eissn
0950-9232issn
1476-5594pii
onc2011112journal_volume
30pub_type
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